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1 | /* cop.h |
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2 | * |
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3 | * Copyright (c) 1991-1994, Larry Wall |
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4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
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8 | */ |
9 | |
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10 | struct cop { |
11 | BASEOP |
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12 | char * cop_label; /* label for this construct */ |
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13 | HV * cop_stash; /* package line was compiled in */ |
14 | GV * cop_filegv; /* file the following line # is from */ |
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15 | U32 cop_seq; /* parse sequence number */ |
16 | I32 cop_arybase; /* array base this line was compiled with */ |
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17 | line_t cop_line; /* line # of this command */ |
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18 | }; |
19 | |
20 | #define Nullcop Null(COP*) |
21 | |
22 | /* |
23 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
24 | */ |
25 | |
26 | /* subroutine context */ |
27 | struct block_sub { |
28 | CV * cv; |
29 | GV * gv; |
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30 | GV * dfoutgv; |
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31 | AV * savearray; |
32 | AV * argarray; |
33 | U16 olddepth; |
34 | U8 hasargs; |
35 | }; |
36 | |
37 | #define PUSHSUB(cx) \ |
38 | cx->blk_sub.cv = cv; \ |
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39 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
40 | cx->blk_sub.hasargs = hasargs; |
41 | |
42 | #define PUSHFORMAT(cx) \ |
43 | cx->blk_sub.cv = cv; \ |
44 | cx->blk_sub.gv = gv; \ |
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45 | cx->blk_sub.hasargs = 0; \ |
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46 | cx->blk_sub.dfoutgv = defoutgv; \ |
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47 | (void)SvREFCNT_inc(cx->blk_sub.dfoutgv) |
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48 | |
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49 | /* We muck with cxstack_ix since _dec may call a DESTROY, overwriting cx. */ |
50 | |
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51 | #define POPSUB(cx) \ |
52 | if (cx->blk_sub.hasargs) { /* put back old @_ */ \ |
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53 | SvREFCNT_dec(GvAV(defgv)); \ |
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54 | GvAV(defgv) = cx->blk_sub.savearray; \ |
55 | } \ |
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56 | if (cx->blk_sub.cv) { \ |
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57 | if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) { \ |
58 | cxstack_ix++; \ |
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59 | SvREFCNT_dec((SV*)cx->blk_sub.cv); \ |
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60 | cxstack_ix--; \ |
61 | } \ |
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62 | } |
63 | |
64 | #define POPFORMAT(cx) \ |
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65 | setdefout(cx->blk_sub.dfoutgv); \ |
66 | SvREFCNT_dec(cx->blk_sub.dfoutgv); |
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67 | |
68 | /* eval context */ |
69 | struct block_eval { |
70 | I32 old_in_eval; |
71 | I32 old_op_type; |
72 | char * old_name; |
73 | OP * old_eval_root; |
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74 | SV * cur_text; |
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75 | }; |
76 | |
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77 | #define PUSHEVAL(cx,n,fgv) \ |
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78 | cx->blk_eval.old_in_eval = in_eval; \ |
79 | cx->blk_eval.old_op_type = op->op_type; \ |
80 | cx->blk_eval.old_name = n; \ |
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81 | cx->blk_eval.old_eval_root = eval_root; \ |
82 | cx->blk_eval.cur_text = linestr; |
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83 | |
84 | #define POPEVAL(cx) \ |
85 | in_eval = cx->blk_eval.old_in_eval; \ |
86 | optype = cx->blk_eval.old_op_type; \ |
87 | eval_root = cx->blk_eval.old_eval_root; |
88 | |
89 | /* loop context */ |
90 | struct block_loop { |
91 | char * label; |
92 | I32 resetsp; |
93 | OP * redo_op; |
94 | OP * next_op; |
95 | OP * last_op; |
96 | SV ** itervar; |
97 | SV * itersave; |
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98 | SV * iterlval; |
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99 | AV * iterary; |
100 | I32 iterix; |
101 | }; |
102 | |
103 | #define PUSHLOOP(cx, ivar, s) \ |
104 | cx->blk_loop.label = curcop->cop_label; \ |
105 | cx->blk_loop.resetsp = s - stack_base; \ |
106 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
107 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
108 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
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109 | if (cx->blk_loop.itervar = (ivar)) \ |
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110 | cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\ |
111 | cx->blk_loop.iterlval = Nullsv; \ |
112 | cx->blk_loop.iterary = Nullav; \ |
113 | cx->blk_loop.iterix = -1; |
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114 | |
115 | #define POPLOOP(cx) \ |
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116 | newsp = stack_base + cx->blk_loop.resetsp; \ |
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117 | SvREFCNT_dec(cx->blk_loop.iterlval); \ |
118 | if (cx->blk_loop.itervar) { \ |
119 | SvREFCNT_dec(*cx->blk_loop.itervar); \ |
120 | *cx->blk_loop.itervar = cx->blk_loop.itersave; \ |
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121 | } \ |
122 | if (cx->blk_loop.iterary && cx->blk_loop.iterary != curstack) \ |
123 | SvREFCNT_dec(cx->blk_loop.iterary); |
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124 | |
125 | /* context common to subroutines, evals and loops */ |
126 | struct block { |
127 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
128 | COP * blku_oldcop; /* old curcop pointer */ |
129 | I32 blku_oldretsp; /* return stack index */ |
130 | I32 blku_oldmarksp; /* mark stack index */ |
131 | I32 blku_oldscopesp; /* scope stack index */ |
132 | PMOP * blku_oldpm; /* values of pattern match vars */ |
133 | U8 blku_gimme; /* is this block running in list context? */ |
134 | |
135 | union { |
136 | struct block_sub blku_sub; |
137 | struct block_eval blku_eval; |
138 | struct block_loop blku_loop; |
139 | } blk_u; |
140 | }; |
141 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
142 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
143 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
144 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
145 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
146 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
147 | #define blk_gimme cx_u.cx_blk.blku_gimme |
148 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
149 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
150 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
151 | |
152 | /* Enter a block. */ |
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153 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
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154 | cx->cx_type = t, \ |
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155 | cx->blk_oldsp = sp - stack_base, \ |
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156 | cx->blk_oldcop = curcop, \ |
157 | cx->blk_oldmarksp = markstack_ptr - markstack, \ |
158 | cx->blk_oldscopesp = scopestack_ix, \ |
159 | cx->blk_oldretsp = retstack_ix, \ |
160 | cx->blk_oldpm = curpm, \ |
161 | cx->blk_gimme = gimme; \ |
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162 | DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n", \ |
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163 | (long)cxstack_ix, block_type[t]); ) |
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164 | |
165 | /* Exit a block (RETURN and LAST). */ |
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166 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
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167 | newsp = stack_base + cx->blk_oldsp, \ |
168 | curcop = cx->blk_oldcop, \ |
169 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
170 | scopestack_ix = cx->blk_oldscopesp, \ |
171 | retstack_ix = cx->blk_oldretsp, \ |
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172 | pm = cx->blk_oldpm, \ |
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173 | gimme = cx->blk_gimme; \ |
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174 | DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n", \ |
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175 | (long)cxstack_ix+1,block_type[cx->cx_type]); ) |
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176 | |
177 | /* Continue a block elsewhere (NEXT and REDO). */ |
178 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
179 | stack_sp = stack_base + cx->blk_oldsp, \ |
180 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
181 | scopestack_ix = cx->blk_oldscopesp, \ |
182 | retstack_ix = cx->blk_oldretsp |
183 | |
184 | /* substitution context */ |
185 | struct subst { |
186 | I32 sbu_iters; |
187 | I32 sbu_maxiters; |
188 | I32 sbu_safebase; |
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189 | I32 sbu_oldsave; |
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190 | bool sbu_once; |
191 | bool sbu_rxtainted; |
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192 | char * sbu_orig; |
193 | SV * sbu_dstr; |
194 | SV * sbu_targ; |
195 | char * sbu_s; |
196 | char * sbu_m; |
197 | char * sbu_strend; |
198 | char * sbu_subbase; |
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199 | REGEXP * sbu_rx; |
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200 | }; |
201 | #define sb_iters cx_u.cx_subst.sbu_iters |
202 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
203 | #define sb_safebase cx_u.cx_subst.sbu_safebase |
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204 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
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205 | #define sb_once cx_u.cx_subst.sbu_once |
206 | #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted |
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207 | #define sb_orig cx_u.cx_subst.sbu_orig |
208 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
209 | #define sb_targ cx_u.cx_subst.sbu_targ |
210 | #define sb_s cx_u.cx_subst.sbu_s |
211 | #define sb_m cx_u.cx_subst.sbu_m |
212 | #define sb_strend cx_u.cx_subst.sbu_strend |
213 | #define sb_subbase cx_u.cx_subst.sbu_subbase |
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214 | #define sb_rx cx_u.cx_subst.sbu_rx |
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215 | |
216 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
217 | cx->sb_iters = iters, \ |
218 | cx->sb_maxiters = maxiters, \ |
219 | cx->sb_safebase = safebase, \ |
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220 | cx->sb_oldsave = oldsave, \ |
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221 | cx->sb_once = once, \ |
222 | cx->sb_rxtainted = rxtainted, \ |
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223 | cx->sb_orig = orig, \ |
224 | cx->sb_dstr = dstr, \ |
225 | cx->sb_targ = targ, \ |
226 | cx->sb_s = s, \ |
227 | cx->sb_m = m, \ |
228 | cx->sb_strend = strend, \ |
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229 | cx->sb_rx = rx, \ |
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230 | cx->cx_type = CXt_SUBST |
231 | |
232 | #define POPSUBST(cx) cxstack_ix-- |
233 | |
234 | struct context { |
235 | I32 cx_type; /* what kind of context this is */ |
236 | union { |
237 | struct block cx_blk; |
238 | struct subst cx_subst; |
239 | } cx_u; |
240 | }; |
241 | #define CXt_NULL 0 |
242 | #define CXt_SUB 1 |
243 | #define CXt_EVAL 2 |
244 | #define CXt_LOOP 3 |
245 | #define CXt_SUBST 4 |
246 | #define CXt_BLOCK 5 |
247 | |
248 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
249 | |
250 | /* "gimme" values */ |
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251 | #define G_SCALAR 0 |
252 | #define G_ARRAY 1 |
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253 | |
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254 | /* extra flags for perl_call_* routines */ |
255 | #define G_DISCARD 2 /* Call FREETMPS. */ |
256 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
257 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |
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258 | #define G_KEEPERR 16 /* Append errors to $@ rather than overwriting it */ |